My first time to see a ghost...

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Well, i am now in my fourth year of high school. My first time is when i was in grade five. What happened is that i and my two friends were talking in the classroom and just us on that floor. While we were talking, we suddenly stopped, guess what... We saw a shadow outside the room in front of the door. We waited for someone to pass by but there is no one that passed. We then ran and report to the principal. Well, the principal said that we saw is really correct and that is really the first time i ever saw a ghost. IF you can see ghost, when is your first time and what happened?